Carb. Question

Stock1528 · 04-20-2010, 12:08 PM

I have a 1972 Chevelle I/SA with a 350 c.i. engine and a turbo 350 trans. The car idles around 1500-1600 rpm in park/neutral but when I put it in gear it drops WAY down to between 900-1000 rpm. I am wondering what would cause this because it is driving me crazy. I know that most stockers only drop 200-300 rpm when they go from park/neutral into gear. Thank you for your help.

Justin Picillo

Paul Merolla · 04-20-2010, 01:47 PM

Every time I've seen that happen, it's ended up being a vacuum leak...one time it was the wrong gasket between the throttle plate and carb body, one time a bad PCV valve, another time worn out throttle shaft bushings, etc., but all vacuum leaks just the same.

04-20-2010, 12:08 PM	#1
Stock1528 Junior Member Join Date: Feb 2005 Location: Warwick, RI Posts: 48 Likes: 0 Liked 0 Times in 0 Posts	Carb. Question I have a 1972 Chevelle I/SA with a 350 c.i. engine and a turbo 350 trans. The car idles around 1500-1600 rpm in park/neutral but when I put it in gear it drops WAY down to between 900-1000 rpm. I am wondering what would cause this because it is driving me crazy. I know that most stockers only drop 200-300 rpm when they go from park/neutral into gear. Thank you for your help. Justin Picillo Last edited by Stock1528; 04-20-2010 at 12:14 PM.

04-20-2010, 01:47 PM	#2
Paul Merolla Senior Member Join Date: Dec 2001 Location: Papillion, NE Posts: 610 Likes: 242 Liked 293 Times in 65 Posts	Re: Carb. Question Every time I've seen that happen, it's ended up being a vacuum leak...one time it was the wrong gasket between the throttle plate and carb body, one time a bad PCV valve, another time worn out throttle shaft bushings, etc., but all vacuum leaks just the same.